Exam 2: Internal Structure of Earth and Plate Tectonics

Crust is consumed at transform boundaries.

Transform plate boundaries are marked by

Tectonic plates move about as fast as

The process of isostasy is responsible for

Plate tectonic processes can affect climate.

The rocks of the core consist mostly of ________.

The concept of seafloor spreading was supported by magnetic polarity stripes on the ocean floor.

The rocks of the core are more dense than the rocks of the mantle.

Why was Alfred Wegener's hypothesis of continental drift not taken seriously by most geologists?

The Earth's magnetic field reverses in a regular pattern every few hundred thousand years.

At the Curie point, iron-bearing minerals orient themselves parallel to the ________.

Alfred Wegener proposed the idea of sea floor spreading.

The Hawaiian Islands are a volcanic arc atop an oceanic subduction zone.

S-waves accelerate as they enter the outer core.

Only a few transform boundaries (<10) mark the Earth's tectonic plates.

How does the lithosphere differ from the asthenosphere?

Transform boundaries do not generate earthquakes.

The Mohorovicic discontinuity represents

A submarine trench is associated with a convergent boundary.

The ________ separates the mantle and the crust.